![]() ![]() Use the cat command to read the contents of the public SSH key on our local computer. If you have password-based SSH access to an account on your server, upload your keys with the SSH method. Now the id_rsa.pub key has been uploaded to the remote account. Now try logging into the machine, with: "ssh check to ensure that only the key(s) you wanted were added. The following message will be displayed: Output It will be located in the remote account’s home ~/.ssh directory called authorized_keys. It will then copy the contents of the ~/.ssh/id_rsa.pub key into a file. The utility will connect to the account on the remote host using the password. usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed - if you are prompted now it is to install the new password: usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed When it finds the key, you will get a prompt for the password of the remote user’s account: Output The utility will scan the local account for the id_rsa.pub key created earlier. Type in yes and then press ENTER to continue. As it is the first time you connect to a new host. It shows that your local computer does not recognize the remote host. The syntax is shown below - ssh-copy-id will see the following output: Output It is the account on which your public SSH key will be copied. Also, specify the user account that you have password-based SSH access to. To use the utility, specify the remote host you want to connect to. You should already have password-based SSH access to your server. The ssh-copy-id tool is added in many operating systems by default. If you do not have ssh-copy-id on the client machine, use the alternate methods shown below. We will copy the public key to the Ubuntu host using a utility called ssh-copy-id. Add the private key on your server for SSH-key-based authentication to log in, as shown in the next steps. You can use the public key on the server to authenticate with the private key on the client machine. Public key authentication is a secure method of logging in to a remote server using an SSH key pair. SHA256:/hk7MJ5n5aiqdfTVUZr+2Qt+qCiS7BIm5Iv0dxrc3ks key's randomart image is: Your public key has been saved in /your_home/.ssh/id_rsa.pub The output is shown below - Your identification has been saved in /your_home/.ssh/id_rsa It prevents unauthorized users from logging in and adds another layer of security. You can enter an optional secure passphrase, which is recommended. ![]() The following prompt will be displayed: OutputĮnter passphrase (empty for no passphrase): Be cautious about selecting yes, as the changes cannot be reversed. You will not be able to authenticate using the previous key if you overwrite the key on the disk. home/your_home/.ssh/id_rsa already exists. If you have generated an SSH key pair before, you may see the following prompt: Output SSH public key authentication is a secure way to log in to a remote server using an existing key pair. ![]() ssh/ subdirectory in your home directory, press enter. You can see the following output after adding the command: OutputĮnter file in which to save the key (/your_home/.ssh/id_rsa): You can also pass in the -b 4096 flag to create a larger 4096-bit key. This will generate an RSA key pair that is 3072-bit long by default. To create an SSH key on Linux, use ssh-keygen. This will generate a key pair that consists of a public and a private key. To create a new SSH key on Linux, run the following command on the client machine: ssh-keygen. Steps to Creating SSH Keys on Ubuntu 20.04 1. Steps to Creating SSH Keys on Ubuntu 20.04 ![]()
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